shingle oak vs oak tree

shingle oak and oak tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
shingle oak	Yes	No	No	No
oak tree	Yes	No	No	No

As nouns, oak tree is a hypernym of shingle oak; that is, oak tree is a word with a broader meaning than shingle oak:

shingle oak: small deciduous tree of eastern and central United States having leaves that shine like laurel; wood is used in western states for shingles
oak tree: a deciduous tree of the genus Quercus; has acorns and lobed leaves

Other hypernyms of shingle oak include oak.

shingle oak (noun)	oak tree (noun)
small deciduous tree of eastern and central United States having leaves that shine like laurel; wood is used in western states for shingles	a deciduous tree of the genus Quercus; has acorns and lobed leaves